<http://schema.org/description>
"As part of the batch of updates on Thursday it was revealed that Apple may soon offer developers the ability to send out promotional codes for in-app purchases, a change from previous App Store policy."^^<http://www.w3.org/2001/XMLSchema#string>
<http://appleinsider.com/articles/14/05/15/apples-app-store-may-soon-support-promo-codes-for-in-app-purchases>